abstract |
Abstract Title: Antiarrhythmic Agents An antiarrhythmic agent of the formula --- (I) or a pharmaceutically acceptable salt thereof; wherein R1 is H, C1-C4 alkyl or C1-C4 alkoxy; X is 0, or a direct link; and R2 and R3, which are the same or different, are each C1-C4 alkyl, with the proviso that when X is , R2 and R3 are the same. |